Merge pull request #113 from wneessen/go1.20-workflow-update

Go1.20 workflow updates

.github/workflows/codecov.yml

@@ -33,7 +33,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go: [1.16, 1.17, 1.18, 1.19]
+        go: [1.16, 1.17, 1.18, 1.19, '1.20']
     steps:
     - name: Checkout Code
       uses: actions/checkout@master
@@ -42,14 +42,14 @@ jobs:
       with:
         go-version: ${{ matrix.go }}
     - name: Install sendmail
-      if: matrix.go == 1.19 && matrix.os == 'ubuntu-latest'
+      if: matrix.go == '1.20' && matrix.os == 'ubuntu-latest'
       run: |
         sudo apt-get -y install sendmail; which sendmail
     - name: Run Tests
       run: |
         go test -v -race --coverprofile=coverage.coverprofile --covermode=atomic ./...
     - name: Upload coverage to Codecov
-      if: success() && matrix.go == 1.19 && matrix.os == 'ubuntu-latest'
+      if: success() && matrix.go == '1.20' && matrix.os == 'ubuntu-latest'
       uses: codecov/codecov-action@v2
       with:
         token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos

.github/workflows/golangci-lint.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v3
         with:
-          go-version: 1.19
+          go-version: '1.19'
       - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3

.github/workflows/sonarqube.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.19.x
+          go-version: '1.20.x'
           
       - name: Run unit Tests
         run: |

README.md

@@ -61,6 +61,15 @@ standard in a MUA.
 We aim for good GoDoc documenation in our library which gives you a full API reference. We also provide a more in-depth documentation website at 
 [go-mail.dev](https://go-mail.dev)
 
+## Compatibility
+
+Go is growing fast and providing great features with every new release. While we'd love to adopt the latest Go features
+into our code, we realize that not everybody using this package can run the latest Go versions. Therefore we try to
+implement alternative solutions for Go versions that do not support these features. Yet, the work needed to maintain
+the separate versions is not to be underestimated. For that reason, we might retire that code at some point. 
+We guarantee that go-mail will always support the last four releases of Go. With two Go releases per year, this gives
+the user a timeframe of two years to update to the next or even the latest version of Go.
+
 ## Support
 We have a support and general discussion channel on Discord. Find us at: [#go-mail](https://discord.gg/dbfQyC4s)